Berkeley CSUA MOTD:Entry 15309
Berkeley CSUA MOTD
 
WIKI | FAQ | Tech FAQ
http://csua.com/feed/
2025/05/24 [General] UID:1000 Activity:popular
5/24    

1999/1/28-29 [Computer/HW/Memory, Computer/SW/Languages/Misc] UID:15309 Activity:nil
1/27    If the name server (DNS/named) caches the domain name<->IP pairs, where
        is the cache file located? Is the cache persistent in reboots?
        \_ It caches them in memory. That's one of the reasons why named
           grows in size the longer it's been running. A reboot (or even kill
           and restart) will clear the cache. --dim
                \-bind is moving away from kill -SIG "control" to use ndc
                [named control program] for more sophisticated control/
                communication with a running named. i dont remember off
                the top of my head if the onld-style signals will continue
                work. --psb
                \_ ndc is just a shell script that sends a kill -SIG you dork.
                \_ If you kill the named process, they will. :-)
2025/05/24 [General] UID:1000 Activity:popular
5/24    

You may also be interested in these entries...
2009/12/3-26 [Computer/Companies/Google] UID:53563 Activity:nil
12/2    Google launches its own DNS. Google Public DNS:
        http://code.google.com/speed/public-dns
        8.8.8.8 and 8.8.4.4
        Kick ass!
        \_ http://radoff.com/blog/2009/12/07/google-dns-benchmarking-and-rationale
        \_ I get 1.7ms pings to 4.2.2.2 and 23ms pings to 8.8.8.8.
	...
2009/10/27-11/3 [Computer/HW/Drives] UID:53474 Activity:nil
10/27   I just read an article that Facebook had moved their database
        to all SSD to speed throughput, but now I can't find it. Has
        anyone else seen this? Any experience with doing this? -ausman
        \_ I hope you're not running mission critical data:
           http://ask.slashdot.org/story/09/10/27/1559248/Reliability-of-PC-Flash-SSDs?from=rss
        \_ Do you have any idea how much storage space is used by Facebook,
	...
2009/8/18-9/1 [Computer/SW/Database, Computer/SW/Languages/Perl] UID:53283 Activity:low
8/18    trying to write an intentionally slow regex.
        what is your worst regex ever?
        this is using MySQL regexp but I'll also accept
        perl format         --brain
        \_ you need to know how regex is implemented internally in order to
           have a worst regex in terms of running time. Something that uses
	...
2008/12/18-2009/1/2 [Recreation/Dating, Computer/HW/Memory, Computer/SW] UID:52277 Activity:nil
12/18   I'm loving the Privacy Browsing feature on Safari. I turn it
        on, browse porn, then turn it off, and no one using my
        computer would ever know that I browsed porn (no history,
        no cache, nada). Loving it man.
        \_ The guy with the backdoor knows. Also, the shadow knows.
           \_ That may be the case and I don't really care about the
	...
2008/11/15-26 [Computer/SW/OS/Windows] UID:51993 Activity:nil
11/14   I have a bunch of pictures and I find that thumbs.db on
        Windows XP to be very useful, especially when you're on NAS
        and the network is slow. Having that said, my Win XP has
        stopped generating thumbs.db even though I've set it to generate
        thumbs.db (Properties->View->Uncheck "Do not cache thumbnails.").
        How do I force Windows to generate Thumbs.db? Googling seems
	...
2008/9/4-8 [Politics/Domestic/Election, Computer/HW/Memory, Computer/SW/WWW/Browsers] UID:51059 Activity:nil
9/4     Someone asked yesterday about the Obama/Ayers link.  It took me a while
        to find a link I was happy with, this one is ok.  This guy goes into
        excruciating detail about the Annenberg Challenge and CAC over a
        number of blog posts.  The full Annenberg documents were only recently
        released, and this post predates the release.  The documents are still
        being digested, so this is far from the final word.
	...
2008/9/4 [Computer/SW/WWW/Browsers] UID:51062 Activity:nil
9/4     Regarding the Firefox 3 memory usage question that I asked on 8/29,
        here are some new numbers (VM Size in MB reported by Task Manager):
                                        2.0.0.16        3.0.1
        - Startup, empty the cache.     13              23
        - Go to http://www.yahoo.com          17              40
        - Open 6 news pages in          43              69
	...
2008/7/20-23 [Computer/Domains] UID:50638 Activity:nil
7/19    Why is OpenDNS popular? It still forwards me to ads when I go
        to an invalid domain. That is really annoying.
        \_ For one thing, they were never vulnerable to the latest round of DNS
           spoofing.
           \_ i think the latest round of dns spoofing attack was overblown.
              yes there was a security hole... but no one ever exploited it.
	...
2012/4/27-6/4 [Computer/SW/Languages/Misc, Computer/SW/Unix] UID:54372 Activity:nil
4/27    I wrote a little shell script to collect iostat data:
        #!/bin/bash
        DATE=`date +%m%d`
        DATADIR=/var/tmp/user
        OUTPUTFILE=$DATADIR/$DATE.out
        while true
	...
2012/5/8-6/4 [Computer/SW/Unix] UID:54383 Activity:nil
5/8     Hello everyone!  This is Josh Hawn, CSUA Tech VP for Spring 2012.
        About 2 weeks ago, someone brought to my attention that our script
        to periodically merge /etc/motd.public into /etc/motd wasn't
        running.  When I looked into it, the cron daemon was running, but
        there hadn't been any root activity in the log since April 7th.  I
        looked into it for a while, but got lost in other things I was
	...
2011/10/26-12/6 [Computer/SW/Unix] UID:54202 Activity:nil
10/24  What's an easy way to see if say column 3 of a file matches a list of
       expressions in a file? Basically I want to combine "grep -f <file>"
       to store the patterns and awk's $3 ~ /(AAA|BBB|CCC)/ ... I realize
       I can do this with "egrep -f " and use regexp instead of strings, but
       was wondering if there was some magic way to do this.
       \_ UNIX has no magic. Make a shell script to produce the ask or egrep
	...
2011/7/30-8/10 [Computer/SW/Languages/Misc] UID:54148 Activity:nil 66%like:54150
7/29    Happy Sysadmin Day
        \_ our "sysadmin" today deleted /home. When we asked her why
           she said she didn't do it. When I checked the sudo logs,
           I found these two commands in order:
               COMMAND=/bin/rm -r /home testuser
               COMMAND=/bin/rm -r /home/testuser
	...
2011/5/19-7/13 [Computer/SW/Languages/Misc] UID:54115 Activity:nil
5/19    If script A runs, and calls script B ..... is it possible for me to exit\
        script A based on results of script B and not continue?
        \_ assume any shell
        \_ Yes.
           \_ without passing the result to some stupid temp file?
              \_ It sounds like you want "scriptb || exit", which will run
	...
2010/4/22-5/10 [Computer/SW/Languages/Misc] UID:53797 Activity:nil
4/22    In Linux is there an easy way to rename the scripts in /etc/rc?.d ?
        For example I want to set all the /etc/rc?.d/S91apache to S100apache
        so that it'll run the ramdisk BEFORE going to apache.
        \_ Sure, just move them.
           \_ I mean is there a script that will rename all of them
              for me? Like: setrc apache2 0 0 1 1 1 1
	...
2009/10/27-11/3 [Computer/SW/Unix] UID:53475 Activity:nil
10/27   http://www.maxgames.com/play/flash-mind-reader.html
        how does this work?
        \_ sh -c 'for ((i=0;i<10;i++)); do for ((j=0;j<10;j++)); do echo "$i$j-(\
$i+$j)" | bc; done ; done' | uniq
        \_ bash -c 'for ((i=0;i<10;i++)); do for ((j=0;j<10;j++)); do echo "$i$j\
-($i+$j)" | bc; done ; done' | uniq
	...
2009/8/19-9/1 [Computer/SW/Unix] UID:53285 Activity:nil
8/18    Hi again, new freebsd guy here again, in bash I was able to go
        LD_LIBRARY_PATH=/opt/foo/lib ./runmyapp
        I managed to do this in tcsh by using setenv in a shell script
        that setenv's the lib path and then executes $1, just wondering
        if there was a way to do it in 1 line from the cmd line as in bash?
        Thanks, btw %2c or %3c worked.  Freebsd, tcsh and vi forever!
	...
2009/5/5-6 [Computer/HW/Laptop] UID:52950 Activity:moderate
5/5     Is there a good (or standard) way to make an offline copy of a w
        ordpress blog (mine, not someone else's)? tia.
        \_ oh man.
           \_ I could cobble something together with curl / wget, but I'd
              rather not if there is a standard way of doing this.  I'm
              pretty new to wordpress / blogging and I just want to keep
	...
2009/2/10-13 [Computer/SW/Security, Computer/SW/Unix] UID:52552 Activity:nil
2/10    I have an sh file that does a mount.. the mount does an
        authentication. I previosly stored the username and password
        from zenity prompts. However, I can't get a return on the password
        field. The following only works on the username:
        mount -t davfs "http://blahblah.com/BLahUser11" /mountdir << EOF
        ${username}
	...
2009/1/14-22 [Computer/SW/Languages/Perl, Computer/SW/Languages/Misc] UID:52378 Activity:nil
1/13    I want to extract a couple integer from an xml file, mainly,
        xml file from http://weather.com so I can put it on my xplanet marker
        file. has anyone done similar things (parse and extract data
        from xml) using shell script instead of python/perl?
        in the world of perl, it make sense to dump things into a hash
        which i can easily extract key/value pair.  can i achieve similar
	...
2008/12/18-2009/1/7 [Computer/SW/Mail] UID:52279 Activity:nil
12/18   Campus USENET service will be terminated on 12/31.
        http://ls.berkeley.edu/mail/micronet/2008/1608.html
        \_ I emailed RobR to tell him. -ausman
        \_ The CSUA is considering asking campus to allow us to run NNTP for
           ucb.class.*, as bSpace sucks major major ass. Thoughts? --t
           \_ That's noble, but maybe the effort would be better spent
	...